feat: Reinitialize frontend with SvelteKit and TypeScript

- Delete old Vite+Svelte frontend
- Initialize new SvelteKit project with TypeScript
- Configure Tailwind CSS v4 + DaisyUI
- Implement JWT authentication with auto-refresh
- Create login page with form validation (Zod)
- Add protected route guards
- Update Docker configuration for single-stage build
- Add E2E tests with Playwright (6/11 passing)
- Fix Svelte 5 reactivity with $state() runes

Known issues:
- 5 E2E tests failing (timing/async issues)
- Token refresh implementation needs debugging
- Validation error display timing

frontend/node_modules/happy-dom/lib/nodes/html-meta-element/HTMLMetaElement.d.ts

@@ -0,0 +1,58 @@
+import HTMLElement from '../html-element/HTMLElement.js';
+/**
+ * HTML Meta Element.
+ *
+ * Reference:
+ * https://developer.mozilla.org/en-US/docs/Web/API/HTMLMetaElement.
+ */
+export default class HTMLMetaElement extends HTMLElement {
+    /**
+     * Returns content.
+     *
+     * @returns Content.
+     */
+    get content(): string;
+    /**
+     * Sets content.
+     *
+     * @param content Content.
+     */
+    set content(content: string);
+    /**
+     * Returns httpEquiv.
+     *
+     * @returns HttpEquiv.
+     */
+    get httpEquiv(): string;
+    /**
+     * Sets httpEquiv.
+     *
+     * @param httpEquiv HttpEquiv.
+     */
+    set httpEquiv(httpEquiv: string);
+    /**
+     * Returns name.
+     *
+     * @returns Name.
+     */
+    get name(): string;
+    /**
+     * Sets name.
+     *
+     * @param name Name.
+     */
+    set name(name: string);
+    /**
+     * Returns scheme.
+     *
+     * @returns Name.
+     */
+    get scheme(): string;
+    /**
+     * Sets scheme.
+     *
+     * @param scheme Scheme.
+     */
+    set scheme(scheme: string);
+}
+//# sourceMappingURL=HTMLMetaElement.d.ts.map